Apple Watch series 3
Watch went dead and won’t charge just gets very hot when plugged in to charger
Apple Watch Series 4, watchOS 5
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Watch went dead and won’t charge just gets very hot when plugged in to charger
Apple Watch Series 4, watchOS 5
OK that’s bad luck, but I still suspect a battery failure. The advice remains the same, stop trying to charge it before the battery swells and bursts the screen from the case, and get it checked by Apple. If the watch is undamaged you should be able to get battery service at a reasonable cost (from memory around $79 in USA, similar elsewhere)
Very Hot is an indication of a hardware problem. Your profile says Series 4 which is still in warranty, so Stop trying to charge it, and Contact Support (link) to arrange getting it checked by Apple.
I have series 4 but it’s my old series 3 that won’t charge so it’s not under warranty
Apple Watch series 3